Final answer:
Transistors enabled miniaturization of electronic circuits, paving the way for the creation of microprocessors.
Explanation:
Transistors were the key invention that allowed for the miniaturization of electronic circuits, leading to the creation of the microprocessor. The development of transistors enabled the integration of large amounts of circuitry into tiny chips, such as the microchip, made of silicon, which revolutionized computing by shrinking the size of electronic components significantly.
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